September arabica coffee (KCU24) on Monday closed up +6.80 (+1.91%), and Sep ICE robusta coffee (RMU24) closed up +206 (+4.76%). Coffee prices Monday moved higher, with robusta up sharply at a 3-1/2 week high. Frost concerns in Brazil pushed coffee prices higher Monday after Rural Clima said widespread frost may occur Tuesday in Brazil’s coffee-growing areas. Frost would add to crop stress caused by dry weather in Brazil that already has threatened to reduce next year’s coffee crop output. Smaller coffee exports from Vietnam, the world’s largest robusta coffee producer, are bullish for prices….